JP2008132601A - Antifalsifying printed material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an antifalsifying printed material in which a dot image in a first dot region can be recognized under a visible condition and a dot image hidden in a second dot region is hardly recognized. <P>SOLUTION: This antifalsifying printed material is the printed material with a base material, on which a continuously gradated visible image and a continuously gradated invisible image are formed by two kinds of dot regions P1 and P2 under the condition that the continuously gradated visible image is formed by arranging a plurality of the first dot regions P1, while the continuously gradated invisible image is formed by doubly printing the second dot regions P2 within the first dot regions P1 by printing the first dot region P1 with colored ink including no infrared absorbing coloring matter, while printing the second dot region P2 with in including metallic powder or with transfer sheet including metallic foil. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention is used for valuable printed matter that requires anti-counterfeiting and falsification preventing functions such as banknotes, passports, securities, and cards.

  In recent years, with the increase in image quality of color copying machines and computerization of color platemaking technology, counterfeiting means for banknotes and securities tend to be diversified. In particular, the resolution of image input / output devices used in the printing industry has significantly improved, and it has become easier to extract fine lines and minute characters used in securities. This was not only forgery by the general commercial printing method consisting of halftone dot composition of 4 colors, but also composed of binary values such as background pattern, color pattern and relief pattern used in many current securities. Things can be extracted with high accuracy by input / output devices such as scanners, and the number of full-scale counterfeit tickets has increased from those using many special color plates.

  Therefore, in order to deal with counterfeiting in recent years, Japanese Patent Application Laid-Open No. 2003-136828 filed earlier by the present applicant is used in general commercial printing when two types of halftone images are evenly arranged on the same plane. Using basic four-color inks of cyan (C), magenta (M) and yellow (Y) that do not contain infrared absorbing pigments, and black (Bk) that includes infrared absorbing pigments, generate visible and invisible images, A halftone dot printed matter and a printing method for printing an invisible image that cannot be reproduced with a current photoengraving apparatus and cannot be recognized unless a special appraisal apparatus or the like is used have been provided. (For example, Patent Document 1)

  However, in Japanese Patent Laid-Open No. 2003-136828, black (Bk) containing an infrared absorbing dye works effectively, but the low brightness (high density) printing color of black (Bk) greatly affects the design of the printing surface. ing. That is, when the printed surface is observed with an infrared camera or the like, if the invisible image provided with black (Bk) is clarified, the maximum area ratio of the halftone dots used for black (Bk) inevitably increases. There is also a problem that the visible image observed with the naked eye becomes dark as a whole.

JP2003-136828

  In view of the above problems, it is required to construct a printing surface that contains an infrared absorbing dye and has high brightness (low density) under visible light and low brightness (high density) under infrared light.

  That is, in a printed matter having a halftone dot image composed of two types of areas, an infrared absorptivity is formed on the halftone dot image of the second halftone dot area printed with a transfer sheet containing an ink containing metal powder or a metal foil. By printing with colored ink containing no pigment, the halftone dot image in the first halftone dot area is recognized in the visible state, and the halftone dot image in the second halftone dot area is concealed. Is aimed at obtaining difficult printed matter.

  When the printed matter is observed under infrared rays, the halftone image in the first halftone area cannot be recognized, and the halftone image in the second halftone area can be recognized. Another object of the present invention is to confirm the halftone image of the second halftone dot region by irradiating the printed matter with an electron beam such as an X-ray because the transfer sheet containing an ink containing metal powder or a metal foil is used. .

  Furthermore, it comprises at least a printed portion of colored ink not containing an infrared absorbing pigment and a printed portion of a transfer sheet containing metal powder or ink containing metal powder, and next to a transfer sheet containing ink or metal foil containing metal powder. It is an object to be able to arbitrarily select the color of the colored ink that does not contain the infrared absorbing pigment to be printed.

  The present invention is a printed material in which a continuous tone visible image and an invisible image are formed on a substrate by two types of halftone dot regions, and a plurality of first halftone dot regions are arranged to display a continuous tone visible image. And the second halftone dot area is printed in an overlapping manner within the first halftone dot area to form a continuous tone invisible image, and the first halftone dot area is a colored ink containing no infrared absorbing dye. The second halftone dot region is a forgery-preventing printed matter printed with an ink containing metal powder or a transfer sheet containing metal foil.

  The present invention is the anti-counterfeit printed matter, wherein the second halftone dot area is smaller than a certain halftone dot diameter set in the first halftone dot area.

  The present invention is characterized in that the halftone dot in the first halftone dot region is an overlay of cyan (C), magenta (M), yellow (Y) or any color that does not contain an infrared absorbing dye. And forgery prevention printed matter.

  The present invention is the anti-counterfeit printed matter, wherein the second halftone dot region is printed with a colorless and transparent matte layer or white ink which does not contain an infrared absorbing dye.

  In a printed matter having a halftone dot image composed of two types of regions, an infrared absorbing dye is applied on the halftone dot image of the second halftone dot region printed with an ink containing metal powder or a transfer sheet containing metal foil. By printing with colored ink not included, it is difficult to recognize that the halftone dot image of the first halftone dot region is recognized in the visible state and the halftone dot image of the second halftone dot region is hidden. Can be obtained.

  When the printed matter is observed under infrared rays, the halftone image in the first halftone area cannot be recognized, and the halftone image in the second halftone area can be recognized. Moreover, since the transfer sheet containing the ink containing metal powder or the metal foil is used, the halftone image of the second halftone dot region can be confirmed by irradiating the printed matter with an electron beam such as X-rays.

  The best mode for carrying out the present invention will be described with reference to the drawings. However, the present invention is not limited to the best mode for carrying out the invention described below, and includes various other embodiments within the scope of the technical idea described in the scope of claims. .

  The transfer sheet containing metal powder or metal foil (hereinafter referred to as “metal ink”) can be observed with both visible light and infrared light, so that visible ink can be observed with colored light containing no infrared absorbing dye. The image can be an invisible image in which the metal ink can be observed only with infrared light.

(Embodiment 1)
FIG. 1 shows a halftone dot configuration of the present invention. The halftone dot image P1 is a continuous tone visible image represented by the halftone dot 1. Black (Bk) containing no infrared absorbing dye, or cyan (C) or magenta (M) containing no infrared absorbing dye. ) And yellow (Y), or a single spot color with low brightness and no infrared absorbing dye. The halftone dot image P2 is a continuous gradation invisible image represented by the halftone dot 2, and is printed with metal ink.

  The halftone dot 1 is printed over the halftone dot 2. That is, although it is two types of halftone dots, it looks like one type of halftone dot at a glance. The halftone dot 1 is composed of halftone dots with a line area ratio that forms a continuous gradation of 1 to 100%. The halftone dot 2 is constituted by a halftone dot having a maximum size of the halftone dot diameter of the halftone dot 1 at a position overlapping the halftone dot 1. Accordingly, the halftone dot 2 may be in a range where the halftone dot 2 does not exceed the size of the halftone dot 1 at a position overlapping with the halftone dot 1. In addition, when the halftone dot 1 of the halftone dot image P1 is cyan (C), magenta (M), and yellow (Y) that does not contain an infrared absorbing dye, cyan (C) or magenta (M) having low brightness is used as a reference. It is appropriate to provide the maximum size of the halftone dot 2 in the screen.

  When the printed matter composed of the halftone dot image P1 and the halftone dot image P2 is observed under visible light, the halftone dot image P1 is visible, and when observed with an infrared camera, the halftone dot image P2 is visible.

(Embodiment 2)
FIG. 2 shows a configuration that looks like one type of halftone dot at a glance, as in the first embodiment. The halftone dot image P1 ′ is a continuous tone visible image represented by the halftone dot 1 ′. Black (Bk) containing no infrared absorbing dye, cyan (C) containing no infrared absorbing dye, magenta Printed with a halftone dot in which three colors of (M) and yellow (Y) are overlaid, or a single color special color with low brightness and no infrared absorbing dye. The halftone image P2 ′ is a continuous gradation invisible image expressed by the halftone dot 2 ′, and is printed with metal ink.

  The halftone dot 1 'is printed over the halftone dot 2'. That is, although it is two types of halftone dots, it looks like one type of halftone dot at a glance. The gradation representation areas of the continuous gradation of the halftone image P1 'and the continuous gradation of the halftone image P2' are defined by the halftone diameter 3. The halftone dot 1 ′ is composed of solids from halftone dots having a halftone dot diameter 3 of the minimum size. The halftone dot 2 ′ is composed of a halftone dot having a maximum halftone dot diameter 3 from a halftone dot having an image area ratio of 1%. Thus, the halftone dot 2 'does not exceed the size of the halftone dot 1'. When the halftone dot 1 ′ of the halftone dot image P1 ′ is cyan (C), magenta (M) and yellow (Y) not containing an infrared absorbing dye, the definition of the halftone dot diameter 3 is cyan (low brightness) The minimum size of the halftone dot used for C) or magenta (M) is appropriate.

  When the printed matter composed of the halftone dot image P1 'and the halftone dot image P2' is observed under visible light, the halftone dot image P1 'is visible, and when observed with an infrared camera, the halftone dot image P2' is visible.

  EXAMPLES Hereinafter, although this invention is demonstrated further in detail using an Example, the content of this invention is not limited to the range of these Examples.

(Example 1)
FIG. 3 shows an anti-counterfeit printed matter a of the present invention. A halftone image P1 is applied to the forgery prevention printed matter a. In the present embodiment, the halftone dot image P1 is applied to a part of the forgery prevention printed matter a. However, the halftone image P1 may be applied to the entire substrate. The elements constituting the halftone dot image are the structures shown in FIG. 1, and the halftone dots 2 in the halftone dot image are invisible halftone dots images having gradation as shown in FIG. 3 using a transfer sheet containing metal foil. P2 is configured.

  A printing method for producing the anti-counterfeit printed matter a will be described below. In Example 1, printing was performed using the printing apparatus having the configuration shown in FIG. The printing apparatus and its printing method will be described in detail with reference to the drawings.

  In a color printing apparatus such as a printer equipped with metal ink or an on-demand printing machine, when the black (Bk) ink used does not contain an infrared absorbing pigment such as a dye, the metal ink and black (Bk) ), The same effect as the halftone dot printed matter of JP-A-2003-136828 can be obtained.

  As shown in FIG. 4, the color printing apparatus 4 of the present invention includes a cyan (C) printing unit 5, a magenta (M) printing unit 6, a yellow (Y) printing unit 7, a black (Bk) printing unit 8, and a metal ink. A printing unit consisting of five colors of the printing unit 9, a paper feeding unit 10, a transport unit 11, a paper discharge unit 12, a processor unit 13 for supplying a halftone image P1 and a halftone image P2 to the printing unit, A storage unit 14 that stores P1 and a halftone dot image P2 and an operation unit 15 that operates the printing order of printing in each printing unit are provided.

  The paper feeding unit 10 feeds a print medium such as paper to the color printing apparatus 4 and sends it to a designated printing unit.

  Each of the printing units composed of the five colors of the cyan (C) printing unit 5, the magenta (M) printing unit 6, the yellow (Y) printing unit 7, the black (Bk) printing unit 8, and the metal ink printing unit 9 is a processor unit 13. In accordance with the control command, printing is performed on the print medium sent from the paper supply unit 10.

  The processor unit 13 is called from the printing image data of the halftone dot image P1 and the halftone dot image P2 from the storage unit 14, and supplies it to each printing unit. Further, the printing unit to be used, the combination thereof, and the printing order are controlled as necessary.

  The transport unit 11 transports the print medium into each printing unit according to the control command of the processor unit 13.

  The paper discharge unit 12 discharges the print medium on which the halftone dot image P1 and the halftone dot image P2 are printed from the color printing apparatus 4.

  The storage unit 14 stores a halftone image P and a halftone image P2 to be supplied to each printing unit.

  The operation unit 15 manually performs an operation for selecting the printing order of each printing unit.

  Next, a method for printing a halftone print according to the present invention will be described. FIG. 5 shows a basic flow of a method for printing a halftone print according to the present invention.

  First, in step f1, the processor unit 13 calls halftone image P1 'data stored in the storage unit 14 and supplies it to the printing unit. At the same time, in step f2, the processor unit 13 calls the halftone image P2 data stored in the storage unit 14 and supplies it to the printing unit.

  Next, in step f3, the metal ink printing unit 9 performs metal ink image printing on the halftone dot image P2.

  Next, in step f4, the printing order is selected. The operation unit 15 can arbitrarily select a color to be printed next to the metal ink. For example, in the first embodiment, printing is performed in the order of description of cyan (C), magenta (M), and yellow (Y), then metal ink is printed, and then black (Bk) is printed.

  Step f5 performs cyan (C) image printing, step f6 performs magenta (M) image printing, step f7 performs yellow (Y) image printing, and step f8 performs black (Bk) image printing.

  As described above, the printed matter obtained according to the first embodiment can obtain a printed matter in which it is difficult to recognize that the halftone dot image P1 is recognized in the visible state and the halftone dot image P2 is hidden. . When this printed matter is observed under infrared rays, the gradation image of the halftone dot image P1 can be recognized as a latent image. The configurations of the first halftone dot region and the second halftone dot region are not limited to the configurations shown in FIGS. 1 and 2. Further, the material used for the metal ink in the second halftone dot region is not limited at all.

(Example 2)
FIG. 6 shows a cross-sectional view of an anti-counterfeit printed matter b which is another embodiment of the present invention. The anti-counterfeit printed matter b has a halftone dot image P1 or P1 ′ applied to the entire surface of the substrate, and the configuration is as shown in FIG. 1 or FIG. The invisible halftone dot image P2 or P2 ′ with gradation is formed using the transfer halftone dot image P1 or P1 ′ and the transfer sheet including the metal foil composed of the halftone dots 2 or 2 ′. However, the configuration is slightly different from that of Example 1 described above, and in order to suppress metallic luster, a colorless transparent mat layer 16 not containing an infrared absorbing dye is overlapped with halftone dots 2 or 2 'on halftone dots 2 or 2'. Printing.

  The printing method for producing the anti-counterfeit printed matter b was performed using the same printing apparatus as in Example 1 described above. When the produced anti-counterfeit printed matter b was observed with an infrared camera, the invisible halftone dot image P2 printed with the transfer sheet containing the metal foil was confirmed to have only P2 'as a visible image. In the second embodiment, the colorless and transparent matte layer is used. Instead, a white ink or other color ink that suppresses the metallic luster and does not affect the halftone image P1 may be used.

The figure explaining Embodiment 1 which is the structure of the halftone dot area | region of this invention. The figure explaining Embodiment 2 which is the structure of the halftone dot area | region of this invention. FIG. 3 is a diagram for explaining the first embodiment. The figure which showed the structure of the color printing apparatus of this invention. The figure which showed the basic flow of the method of printing the halftone print of this invention. FIG. 6 is a diagram for explaining Example 2;

Explanation of symbols

1 halftone dot 1 'constituting halftone dot image P1 of first halftone dot area halftone dot 2 constituting halftone dot image P1' of first halftone dot area constituting halftone dot image P2 of second halftone dot area Halftone dot 2 'halftone dot 3 constituting halftone dot image P2' in the second halftone dot area color printing device 5 cyan (C) printing unit 6 magenta (M) printing unit 7 yellow (Y) printing Section 8 Black (Bk) printing section 9 Transfer sheet printing section 10 containing ink containing metal powder or metal foil 10 Paper feeding section 11 Conveying section 12 Paper discharging section 13 Processor section 14 Storage section 15 Operation section 16 Colorless transparent mat layer a Forgery Anti-counterfeit print a 'Anti-counterfeit print b Anti-counterfeit print b' Anti-counterfeit print P1 Halftone image P1 'Halftone image P2 Halftone image P2' Halftone image q3 Graphic q4 Graphic

Claims (4)

A printed matter in which a continuous tone visible image and an invisible image are formed by using two types of halftone dot regions on a substrate, and a plurality of first halftone dot regions are arranged to form the continuous tone visible image. The second halftone dot region is printed in an overlapping manner within the first halftone dot region to form the continuous tone invisible image, and the first halftone dot region is a colored ink containing no infrared absorbing dye. And the second halftone dot region is printed with an ink containing metal powder or a transfer sheet containing metal foil. 2. The forgery-preventing printed matter according to claim 1, wherein the second halftone dot area is smaller than a predetermined halftone dot diameter set in the first halftone dot area. The halftone dot in the first halftone dot region is a superposition of cyan (C), magenta (M), yellow (Y) or any color that does not contain an infrared absorbing dye. 1 or 2 anti-counterfeit printed matter. 4. The forgery-preventing printed matter according to claim 1, wherein a colorless and transparent matte layer or white ink not containing an infrared-absorbing dye is overprinted on the second halftone dot region.

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